/*
http://qt-apps.org/content/show.php/QProgressIndicator?content=115762
*/
#include "QProgressIndicator.h"
#include <QPainter>

namespace ProgressIndicator
{

    QProgressIndicator::QProgressIndicator(QWidget* parent)
            : QWidget(parent),
            m_angle(0),
            m_timerId(-1),
            m_delay(40),
            m_displayedWhenStopped(false),
            m_color(Qt::black)
    {
        setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
        setFocusPolicy(Qt::NoFocus);
    }

    bool QProgressIndicator::isAnimated () const
    {
        return (m_timerId != -1);
    }

    void QProgressIndicator::setDisplayedWhenStopped(bool state)
    {
        m_displayedWhenStopped = state;

        update();
    }

    bool QProgressIndicator::isDisplayedWhenStopped() const
    {
        return m_displayedWhenStopped;
    }

    void QProgressIndicator::startAnimation()
    {
        m_angle = 0;

        if (m_timerId == -1)
            m_timerId = startTimer(m_delay);
    }

    void QProgressIndicator::stopAnimation()
    {
        if (m_timerId != -1)
            killTimer(m_timerId);

        m_timerId = -1;

        update();
    }

    void QProgressIndicator::setAnimationDelay(int delay)
    {
        if (m_timerId != -1)
            killTimer(m_timerId);

        m_delay = delay;

        if (m_timerId != -1)
            m_timerId = startTimer(m_delay);
    }

    void QProgressIndicator::setColor(const QColor & color)
    {
        m_color = color;

        update();
    }

    QSize QProgressIndicator::sizeHint() const
    {
        return QSize(20,20);
    }

    int QProgressIndicator::heightForWidth(int w) const
    {
        return w;
    }

    void QProgressIndicator::timerEvent(QTimerEvent * /*event*/)
    {
        m_angle = (m_angle+30)%360;

        update();
    }

    void QProgressIndicator::paintEvent(QPaintEvent * /*event*/)
    {
        if (!m_displayedWhenStopped && !isAnimated())
            return;

        int width = qMin(this->width(), this->height());

        QPainter p(this);
        p.setRenderHint(QPainter::Antialiasing);

        int outerRadius = (width-1)*0.5;
        int innerRadius = (width-1)*0.5*0.38;

        int capsuleHeight = outerRadius - innerRadius;
        int capsuleWidth  = (width > 32 ) ? capsuleHeight *.23 : capsuleHeight *.35;
        int capsuleRadius = capsuleWidth/2;

        for (int i=0; i<12; i++)
        {
            QColor color = m_color;
            color.setAlphaF(1.0f - (i/12.0f));
            p.setPen(Qt::NoPen);
            p.setBrush(color);
            p.save();
            p.translate(rect().center());
            p.rotate(m_angle - i*30.0f);
            p.drawRoundedRect(-capsuleWidth*0.5, -(innerRadius+capsuleHeight), capsuleWidth, capsuleHeight, capsuleRadius, capsuleRadius);
            p.restore();
        }
    }
}
